Air-brake for railway-cars



mi. 652,233. emmen lune I9, |900.

` n. w. usBEv.

MR BRAKE FUR `R |LWAY GARS.

" (Application med Mmm, 1897.)

` (No Nudel.)l

,av/@mower I I I .50.56% Xg M+ UNITED STATES PATENT Orifice.'-

HOSEA LIBBEY, OF BOSTON, MASSACHUSETTS.

AIR-BRAKE FOR RAILWAY-CARS.

SPECIFICATION forming part ot' Letter Application filed April 13, 1897 ject being to construct an apparatus that can be applied to each car for operating the brakes.

The invention consists of certain 'arrangement of parts, as hereinafter set forth, and pointed out in the claims.

Referring to the accompanying drawings, Figure l represents a longitudinal vertical section of a portion of a car with an air-brake embodying my invention applied thereto. Fig. 2 is a transverse vertical section of the same. Fig. 3 is a plan view.

A represents the car; B, the truck; D D, the axles; E E, the wheels, and C C the rails.

The car is preferably driven by an electric motor, which may be mounted upon 'one of the axles D, as shown'in dotted lines, and the electricity supplied by a T-rail F, arranged by the side ot' the rail C, and conducted'to the motor through a ring in lthe edge of the flange ot the wheel and a trolley G, running uponAv Sam.

On one of the axles D is mounted an ecceneV tric H, that by a rod h operatesthe piston of an air-pump I, that is by a'tlexible pipe J attached to an air-reservoir K, itted witha suitable safety-valve and secured to the bottom of the car. To the reservoir K a pipe L is secured, to which is connected a two-way valve M, operated by a lever N through a connecting-rod fa. To the valve M is connected a pipe L', to which one end of a flexible pipe P is secured, the other-'endet which is connected to a cross-pipe Q, each end of which is tted with a small cylinder q, having a piston carrying a rod the outer end of which is attached to one of the brake-beams R, which is of ordinary construction and fitted with shoes and hung by springs in the usual manner. Motion is transmitted from the brake-beam R to the brake-beam R by a series of levers s Patent No. 652,233, dated June 19, 1900.

. seninassinic. (nomma) and rods-that is to say, to the beam R is attached a lever l, fulcrumed on a rod 2, carried by a plate 3, secured to the truck B. To the outer end ot this lever is secured a rod 4, the other end of which is attached to one end of a lever 5, also fulcrumed on a rod 6, ldarried by the truck B. To the other end of the lever 5 is attached a rod 7, the outer end of which is attached to alever 8, fulcrumed on a rod 9, securedto the truck B, the other end of which lever is attached to the brake-beam R'.

The operation is as follows: Then the car is in motion, the axle D,tbieing rotated, causes the eccentric H to operate the rod h and pisthe pipe J into the air-reservoir K, and should the pressure in the reservoir exceed the desired amount then the valve will open and allow the air to escape until reduced to the proper pressure. Then it is desired to apply the brakes, the lever N is moved in the desired direction, so as to open the valve M and allow air to pass out of the reservoir, K into and through pipes L P Q and into the cylinders q, where the pressure being exerted upon the pistons forces the brake-'beam inward until the shoes are in contact with the treads of the wheels, and at the same time a corresponding Amotion is imparted Vto the other brake-beam through the levers and rods l, 4, 5, '7, and 8. Thus the brakes are applied to all the wheels at the same time. When it is desired to remove the brakes from the wheels, the lever N is moved so that the valve M cuts oii connection between the pipes L and L and opens a connection between the pipe L and a nipple in said valve, whereby the air in the pipes P Q escapes andthe brakebeams are drawn back by springs in the usual manner.

It will be .seen that by this construction each car can be fitted with an independent air-brake, and if each car is supplied with an electric motor a locomotive would not be required. It will also be seen that an air-brake constructed as described may be applied to the ordinary street-cars What I claim isl. lThe combination with a car, of springsupported transverse oppositely disposed brake-beams, a transverse pipe having cyli inders at its ends, pistons working in said ton of the air-pump I, thus forcing air through IOO cylinders and connected directly to the said beams at opposite ends thereof; levers fulcrnmed to rigid portions of the truck-frame at opposite ends thereof, and pivotally connected to the centers of the respective brakebeams; a third lever fnlcrnmed to an intermediate rigid portion ofthe truck-frame; rods connecting the outer ends of the irst'named levers With opposite ends of the intermediate lever, whereby the movement of one brakebeam is transmitted in an opposite direction to the other brakehealn, a reservoir connected with said pipe, a two-Way valve in said connection, and means for supplying air toV said reservoir, substantially as specified.

2. The combination with a car, of springsupported transverse oppositely disposed brake-beams, a transverse pipe having cylinders at its ends, pistons Working in. said cylinders and connected directly to the ends of said beam, levers fnlcrnmed to rigid portions of the truck-frame at opposite ends thereof, and pivotally connected to the centers of the respective brake-beams; a third lever fulcrnmed to an intermediate rigid portion of the truck-frame; rods connecting the oiit'er ends of the first-named levers with opposite ends of the intermediate lever, 1Whereby the movement of one brake-beam is transmitted in an opposite direction to the other brake-beam, a reservoir connected with said pipe, a tivo-Way valve in said connection, an air-pn mp connected with said reservoir, an eccentric on the car-axle, and a piston in said pn mp having its stem connected directly to said eccentric, substantially as and for the purpose specified.

3. The combination with the truck, the Wheels, and brakebeams at opposite ends of the truck; of levers fulcrumed to rigid portions of the truck at opposite ends thereof, and pivotally connected to the centers of the respective brake-beams; a third lever fnlcrnmed to an intermediate rigid portion of the truck-frame; rods connecting the onter ends of the lirst-named levers with opposite ends'of the intermediate lever, whereby the vmovement of one brake-beam imparts a corresponding movement to the other brakebeam; and means for operating one of said H.brake-beams; substantially as described.

In testimony whereof I have signed my name to this specilication, in the presence of two subscribing Witnesses, on this 29th day of March, A. D. 1897.

IIOSEA YV. LIBBEY.

Witnesses:

OHAs, STEERE, EDWIN PLANTA. 

